740i VCT vault code

Hi anybody im getting two fault codes up on my 740i 4.4 they are: P0011 and P0021 (timing over advanced) I replaced both camshaft positioning solenoids but still get the codes up. I can cancel the codes and all is well but as soon as I go through a drive cycle (turn the engine off/on) the codes return and I lose power.(timing over advanced) anybody have any ideas? Thanks Rick